### Description
I am using this product to help my clients(about tens of thousands ) to freely access the network. Now some users (about a total of less than a hundred)have told me that they cannot access the banned network after the connection is successful. Their IP has not changed, such as visiting www.ipip.net can get their own computer's IP, their virtual network card is normal, I uninstalled the re-installation, the first connection can be used for a few seconds, the IP is changed, after a few seconds in the observation of IP has become the original , I installed the latest version of the client and server, still have this problem, use win7, win10 have this situation, I do not know how to solve this problem, can you help me?